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    Fronst master cylinder

    I suppose it's shot. I did a rebuild with a genuine Suzuki kit, replaced the sight glass, cleaned and repainted it and now I can't get any pressure at the output. I put it in a vise and pumped the handle until blue in the face and nothing.

    This bike has had so many problems it's unreal. If I had to do it all over again, I'd be way ahead parting it out.

    If anyone has any suggestions as to what else to try... I guess I'll try to find another M/C for an '83 GS750. How about suggestion on that front. I really don't want to purchase used again and go through this entire process once more.
    Last edited by Guest; 05-20-2009, 02:01 PM.

    #2
    There are 2 holes in the bottom of the MC (on the inside) one is small and the other is tiny (I need glasses to see it and my eye's ain't too bad). My guess is that one or the other is blocked.
    79 GS1000S
    79 GS1000S (another one)
    80 GSX750
    80 GS550
    80 CB650 cafe racer
    75 PC50 - the one with OHV and pedals...
    75 TS100 - being ridden (suicidally) by my father

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      #3
      Take the handle off and push the plunger in with a wooden dowel or a screw driver.
      De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

      http://www.thegsresources.com/_forum...35#post1625535

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        #4
        Make sure those small orifices are open as already mentioned, you can also try to draw a vacuum on the outlet port. This helps draw fluid into the cylinder and prime the pump so to speak.
        Ed

        To measure is to know.

        Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

        Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

        Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

        KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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          #5
          Or in laymans terms - Suck on a tube connected to one of the caliper bleed nipples
          1980 GS1000G - Sold
          1978 GS1000E - Finished!
          1980 GS550E - Fixed & given to a friend
          1983 GS750ES Special - Sold
          2009 KLR 650 - Sold - gone to TX!
          1982 GS1100G - Rebuilt and finished. - Sold
          2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

          www.parasiticsanalytics.com

          TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

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            #6
            Just had to buy a new front m/c. For a GS1000g cost me £186.
            I didnt want to be used as now I know it'll be workin for atleast another 29 yrs

            Steve

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              #7
              I'm an idiot. I took the darn thing apart again and noticed I put the plunger together wrong. I had the rubber seal before the spring instead of the other way around. That's what I get for being in a hurry.

              I've beld the brakes now and they work to a point. There still must be air in the line as they need to be pumped up.

              When I get done with this bike I'm through with rebuilding these for a while.

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